Description

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

a race condition was found in the mac80211 implementation, a framework
used for writing drivers for wireless devices. An attacker could trigger
this flaw by sending a Delete Block ACK (DELBA) packet to a target system,
resulting in a remote denial of service. Note: This issue only affected
users on 802.11n networks, and that also use the iwlagn driver with Intel
wireless hardware. (CVE-2009-4027, Important)

a flaw was found in the gfs2_lock() implementation. The GFS2 locking code
could skip the lock operation for files that have the S_ISGID bit
(set-group-ID on execution) in their mode set. A local, unprivileged user
on a system that has a GFS2 file system mounted could use this flaw to
cause a kernel panic. (CVE-2010-0727, Moderate)

a divide-by-zero flaw was found in the ext4 file system code. A local
attacker could use this flaw to cause a denial of service by mounting a
specially-crafted ext4 file system. (CVE-2009-4307, Low)

These updated packages also include several hundred bug fixes for and
enhancements to the Linux kernel. Space precludes documenting each of these
changes in this advisory and users are directed to the Red Hat Enterprise
Linux 5.5 Release Notes for information on the most significant of these
changes:

All Red Hat Enterprise Linux 5 users are advised to install these updated
packages, which address these vulnerabilities as well as fixing the bugs
and adding the enhancements noted in the Red Hat Enterprise Linux 5.5
Release Notes and Technical Notes. The system must be rebooted for this
update to take effect.

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